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经营范围
发明名称
Pressure-actuated expanding anchor
摘要
申请公布号
US3311012(A)
申请公布日期
1967.03.28
申请号
US19650438881
申请日期
1965.03.11
申请人
WILLIAMS CHESTER I
发明人
WILLIAMS CHESTER I.
分类号
E21D20/02
主分类号
E21D20/02
代理机构
代理人
主权项
地址
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